document.write( "Question 1018132: Write the expression as the sine, cosine, or tangent of an angle.\r
\n" ); document.write( "\n" ); document.write( "cos 112° cos 45° + sin 112° sin 45° \n" ); document.write( "

Algebra.Com's Answer #634282 by ikleyn(52814) $\"\"$ $\"About$

You can put this solution on YOUR website!
.
\n" ); document.write( "Write the expression as the sine, cosine, or tangent of an angle.\r
\n" ); document.write( "\n" ); document.write( "cos 112° cos 45° + sin 112° sin 45°
\n" ); document.write( "-------------------------------------------\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "

\r\n" );
document.write( "1.\r\n" );
document.write( "cos(112°)*cos(45°) + sin(112°)*sin(45°) = cos(112°)*cos(-45°) - sin(112°)*sin(-45°) =          \r\n" );
document.write( "\r\n" );
document.write( "                                          Apply the formula for cos of the sum of angles for 112° and -45°\r\n" );
document.write( "                                          See the lesson Addition and subtraction formulas in this site.\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "= cos(112° - 45°) = cos(67°).\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "2.\r\n" );
document.write( "Of which angle?\r\n" );
document.write( "

\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "

\n" );